Is sulfa in doxycycline

No doxycycline is not a sulfa containing compound, so you may take it safely if you are allergic to sulfa drugs.

You should be aware, however, that doxycycline may cause photosensitivity, so you should wear appropriate clothing, or you may get easily sunburned or develop a rash if you are exposed to sunlight. Do not take this medication if you are or may be pregnant, or if you are breastfeeding.

The pill form of doxycycline doesn't contain sulfa, but the liquid oral suspension does! So be sure to never take the liquid!